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EP0149843B1 - Process and device for measuring small quantities of a low-boiling liquefied gas - Google Patents

Process and device for measuring small quantities of a low-boiling liquefied gas Download PDF

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Publication number
EP0149843B1
EP0149843B1 EP19840116275 EP84116275A EP0149843B1 EP 0149843 B1 EP0149843 B1 EP 0149843B1 EP 19840116275 EP19840116275 EP 19840116275 EP 84116275 A EP84116275 A EP 84116275A EP 0149843 B1 EP0149843 B1 EP 0149843B1
Authority
EP
European Patent Office
Prior art keywords
outlet opening
gas
liquid
tank
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19840116275
Other languages
German (de)
French (fr)
Other versions
EP0149843A2 (en
EP0149843A3 (en
Inventor
Guido Büschkens
Peter Nobis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Priority to AT84116275T priority Critical patent/ATE39561T1/en
Publication of EP0149843A2 publication Critical patent/EP0149843A2/en
Publication of EP0149843A3 publication Critical patent/EP0149843A3/en
Application granted granted Critical
Publication of EP0149843B1 publication Critical patent/EP0149843B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
    • B65B31/006—Adding fluids for preventing deformation of filled and closed containers or wrappers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0119—Shape cylindrical with flat end-piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0626—Multiple walls
    • F17C2203/0629—Two walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0408—Level of content in the vessel
    • F17C2250/0413—Level of content in the vessel with floats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/02—Improving properties related to fluid or fluid transfer
    • F17C2260/024—Improving metering
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y10T137/0391—Affecting flow by the addition of material or energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]

Definitions

  • the invention relates to a method for shutting off and / or dosing a liquid according to the preamble of claim 1 and a device for carrying out the method according to the preamble of claim 6.
  • FR-A-1497036 describes a decanting process with which the possibility of decanting very large quantities of liquid in a very short time is to be made possible with simple operation.
  • a gas cushion under increased pressure is built up under a cap, which covers a transfer line, with which the line opening is closed (diving bell principle). The pressure of the gas pumped under the cap increases depending on the level of the liquid.
  • This gas cushion generated under the cap only has to be set up once and then blocks the flow of the liquid through the transfer line without further supply of a compressed gas.
  • This gas cushion can only block the transfer line against the flow of the liquid of the container if the line opening is covered with the cap in the direction of flow of the liquid or if the upper section of the transfer line is rotated by 180 °.
  • the invention has for its object to enable a trouble-free shut-off and / or metering a low-boiling, liquefied gas in a simple manner.
  • an interruption in the supply of the sealing gas should lead to an immediate exit of the liquefied gas from the outlet opening.
  • the advantages achieved by the invention are, in particular, that trouble-free starting and stopping of a partially boiling, liquefied gas jet emerging from an outlet opening is ensured in the simplest manner.
  • the outlet opening and the chamber in particular, but possibly also the entire system (container, line) can be flushed with dry gas.
  • the device shown in Fig. 1 consists of a sintered metal body 1, which is located at the end of the line 2, which serves to supply the liquefied gas.
  • the sintered metal body 1 is arranged in a container 3 which, in a container wall 14, contains an outlet opening 4 for liquefied gas arranged at a distance 21 within the container 3 and in its upper part a plurality of discharge openings 5 for evaporated gas.
  • the outlet opening 4 is arranged in a preferably cylindrical body 22 which has a thread 24 on its circumference 23. With the external thread 24, the body 22 is screwed into a pipe socket 26 provided with an internal thread 25, the length 27 of which protrudes into the container 3 is greater than the width 28 of the body 22.
  • the pipe socket 26 is arranged with the end face 30 facing the outlet side 29 of the outlet opening 4 in an opening of the container wall 14 corresponding to its outer diameter 31 and welded to the container wall 14.
  • a cup-shaped, porous sintered metal body 13 is installed on a disk 33 which is fixedly connected to the stub connector 26 and which forms a chamber 15 separated from the container 3 with the disk 33 forming the bottom.
  • a line 16 is connected to the chamber 15 and is blocked by means of a solenoid valve 17.
  • the container 3 is in turn surrounded by a second container 6 provided with insulation. Between Intermediate space 8 is formed between containers 3 and 6.
  • the container 6 and the insulation 7 have a gas outlet opening 9 which is arranged below the outlet opening 4 for liquefied gas in the container 3.
  • the operation of the device according to the invention is as follows:
  • the pressurized and mixed with gas liquefied gas, for example nitrogen, passes through line 2 into sintered metal body 1, the cross section of which is larger than that of the feed line.
  • the sintered metal body 1 is permeable to gaseous and liquefied gas.
  • the relaxed, now at atmospheric pressure and boiling at -196 ° Celsius liquid nitrogen 10 collects at the bottom of the container 3.
  • the likewise -196 ° Celsius cold gaseous nitrogen passes through the discharge openings 5 into the space 8 between the containers 3 and 6 a.
  • the gas flow is indicated by arrows 11.
  • the cold gas now flows slowly to the large outlet opening 9 and cools the entire device so deeply that as little heat as possible is supplied from the outside to the liquid nitrogen in the container 3.
  • the jet of liquid nitrogen emerging through the outlet opening 4 is not disturbed by the gas flow. Since the outlet opening 4 consists of an exchangeable body 22, the strength of the emerging liquid jet can be changed as needed per unit of time. In addition to the cross section of the outlet opening 4, the continuously exiting quantity of volatile nitrogen per unit of time is also determined by the level of the liquid nitrogen 10. The liquid level is therefore kept constant by means of a height-adjustable measuring probe 12, which opens or closes a solenoid valve, which is arranged in line 2 and is not shown, as required. The metered liquid jet continuously emerging through the outlet opening 4 is reliably blocked by the continuous supply of a sealing gas into the chamber 15.
  • the outlet opening 4 is flushed with liquid nitrogen 10 over the entire width 28, so that the outlet opening 4 is cooled during the entire period of the blocking of the liquid jet .
  • cooling of the device is achieved by the rising of the sealing gas bubbling through the liquid nitrogen 10 into the intermediate space 8 even during the blocking of the liquid jet.
  • a shut-off pressure of in particular 0.1 to 0.4 bar above the pressure of the liquid nitrogen with the lowest gas consumption, a sufficient sealing pressure is achieved which frees the chamber 15 from the liquid and keeps the outlet opening 4 dry without mixing of the dry sealing gas comes with the liquid.
  • the low shut-off pressure is achieved by the arrangement of the sintered metal body 13 in front of the outlet opening 4, whereby on the one hand the hydrostatic pressure of the liquid nitrogen 10 on the chamber 15 is reduced and on the other hand additional foreign particles, such as metal chips, are kept away from the outlet opening 4.
  • the sealing gas which is conveyed into the chamber 15 with a preferably small chamber volume of approximately 10 cm 3 with this pressure, escapes on the one hand through the outlet opening 4 with a diameter of approximately 2 mm in this chamber volume and on the other hand through the irregularly shaped openings 34 of the sintered metal body 13 If the gas supply is interrupted via the solenoid valve 17 arranged in the line 16, liquid nitrogen immediately emerges again at the outlet opening 4 without a measurable time difference between the interruption of the gas supply and the exit of the liquid jet being ascertainable.
  • other cold-resistant filters such as sieves, can also be used.
  • the total openings 34 of the sintered metal body 13 must be larger than the outlet opening 4 in order to avoid delays in the liquid throughput through the outlet openings 4.
  • cryogenic boiling gases of the metering device as sealing or drying gases has proven to be particularly advantageous.
  • other dry sealing gases whose boiling temperature is below that of the liquid gases, such as, for. B. helium gas for N 2- liquid or N 2 gas for argon liquid to use.
  • FIG. 2 shows a further embodiment of the shut-off device according to the invention, a vertical arrangement of the chamber 15 being shown in FIG. 2a and a horizontal arrangement of the chamber 15 being schematically shown in FIG. 2b.
  • the chamber 15 is in this case formed by an antechamber 18 of the container 3 which is formed in front of the container wall 14 and whose passage opening 20 for the liquid nitrogen is closed with a plate-shaped sintered metal body 13.
  • the outlet opening 4, which is particularly simple and inexpensive to produce by the method according to the invention, is arranged in the antechamber 18.
  • the line 16 opens into the chamber 15 for supplying the sealing gas, which can be connected to the chamber 15 in a horizontal or vertical position (dashed line).
  • FIG. 3a schematically shows a tubular container 3 arranged in a horizontal position, in whose end-side container wall 14 the outlet opening 4 is arranged.
  • the chamber 15 of the tubular container 3 is created by installing a plate-shaped sintered metal body 13 in front of the outlet opening 4.
  • the line 16 for supplying the sealing gas is connected to the chamber 15.
  • the shut-off device works without a sintered metal body 13.
  • the chamber 15 is hereby formed by the gas bubble obtained within the tubular container 3.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Measuring Volume Flow (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Medicinal Preparation (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • External Artificial Organs (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Vacuum Packaging (AREA)
  • Cookers (AREA)

Abstract

The invention concerns a process and device for metering small amounts of a low boiling liquified gas which flows from an orifice of a cold-insulated vessel. In this process and device the orifice of the vessel is sealed off by a gas bubble.

Description

Die Erfindung betrifft ein Verfahren zum Absperren und/oder Dosieren einer Flüssigkeit nach dem Oberbegriff des Anspruchs 1 und eine Vorrichtung zur Durchführung des Verfahrens nach dem Oberbegriff des Anspruchs 6.The invention relates to a method for shutting off and / or dosing a liquid according to the preamble of claim 1 and a device for carrying out the method according to the preamble of claim 6.

Beim Dosieren kleiner Mengen eines tiefsiedenden, verflüssigten Gases, speziell mit einem LNrDosiergerät, muss ein gleichmässiger, störungsfreier und jederzeit absperrbarer Durchsatz des flüssigen Gases, der bei Bedarf auch taktweise geschaltet werden kann, erreicht werden.When dosing small amounts of a low-boiling, liquefied gas, especially with a LNr dosing device, a uniform, trouble-free and at any time lockable throughput of the liquid gas must be achieved, which can also be switched periodically if necessary.

Aus der DE-A-27 32 318 ist eine Einrichtung zum Dosieren des flüssigen Stickstoffes bekannt, bei der eine um eine vertikale Achse drehbare Scheibe unter der Auslauföffnung des Stickstoffes entlang bewegt wird. Je nach Form der Scheibe wird dabei die Auslauföffnung mehr oder weniger verschlossen. Mit einer solchen mechanischen Einrichtung ist jedoch nur eine taktweise Dosierung des flüssigen Stickstoffs möglich.From DE-A-27 32 318 a device for metering the liquid nitrogen is known, in which a disk which is rotatable about a vertical axis is moved along under the outlet opening of the nitrogen. Depending on the shape of the disc, the outlet opening is more or less closed. With such a mechanical device, however, only a cyclical metering of the liquid nitrogen is possible.

Weiterhin ist aus der DE-A-31 41 465 bekannt, die Dosierung des tiefsiedenden, verflüssigten Gases durch ein die Auslauföffnung bildendes Nadelventil zu regeln. Hierbei wird der Ventilschaft des Nadelventils von einem Solenoid nach oben gezogen, so dass flüssiger Stickstoff aus dem Behälterkörper der Dosiervorrichtung austreten kann.Furthermore, it is known from DE-A-31 41 465 to regulate the metering of the low-boiling, liquefied gas by means of a needle valve forming the outlet opening. The valve stem of the needle valve is pulled upwards by a solenoid so that liquid nitrogen can escape from the container body of the metering device.

Dabei ist es allerdings nötig, nach langen Stillstanszeiten mit leerwerdendem Behälter und nachfolgender Neubefüllung den angefrorenen Ventilsitz bzw. den nach dem Öffnen nicht mehr dicht schliessenden Ventilsitz mittels einer Heizeinrichtung betriebsbereit zu machen. Auch führen während des Betriebs durch Luftfeuchtigkeit hervorgerufene Eiskristalle an dem Ventilsitz zu einem ungleichmässigen Fluss des flüssigen Gases.However, after long periods of inactivity with an empty container and subsequent refilling, it is necessary to use a heating device to make the frozen valve seat or the valve seat, which no longer closes tightly after opening. Also, ice crystals on the valve seat caused by air humidity during operation lead to an uneven flow of the liquid gas.

In der FR-A-1497036 wird ein Umfüllverfahren beschrieben, mit dem bei einfacher Bedienung die Möglichkeit der Umfüllung sehr grosser Flüssigkeitsmengen in sehr kurzer Zeit ermöglicht werden soll. Hierzu wird unter einer Kappe, die eine Umfülleitung abdeckt, ein unter erhöhtem Druck stehendes Gaspolster aufgebaut, mit dem die Leitungsöffnung verschlossen wird (Tauchglockenprinzip). Der Druck des unter die Kappe geförderten Gases erhöht sich in Abhängigkeit von der Höhe des Flüssigkeitsspiegels. Dieses unter der Kappe erzeugte Gaspolster muss nur einmal aufgebaut werden und sperrt dann den Durchfluss der Flüssigkeit durch die Umfülleitung ohne weitere Zuführung eines Druckgases.FR-A-1497036 describes a decanting process with which the possibility of decanting very large quantities of liquid in a very short time is to be made possible with simple operation. For this purpose, a gas cushion under increased pressure is built up under a cap, which covers a transfer line, with which the line opening is closed (diving bell principle). The pressure of the gas pumped under the cap increases depending on the level of the liquid. This gas cushion generated under the cap only has to be set up once and then blocks the flow of the liquid through the transfer line without further supply of a compressed gas.

Dabei kann dieses Gaspolster die Umfülleitung nur gegen den Durchfluss der Flüssigkeit des Behälters sperren, wenn in Fliessrichtung der Flüssigkeit die Leitungsöffnung mit der Kappe abgedeckt oder wenn der obere Abschnitt der Umfülleitung um 180° gedreht ist.This gas cushion can only block the transfer line against the flow of the liquid of the container if the line opening is covered with the cap in the direction of flow of the liquid or if the upper section of the transfer line is rotated by 180 °.

Der Erfindung liegt die Aufgabe zugrunde, ein störungsfreies Absperren und/oder Dosieren eines tiefsiedenden, verflüssigten Gases in einfacher Art und Weise zu ermöglichen. Hierbei soll eine Unterbrechung der Zufuhr des Verschlussgases zu einem sofortigen Austritt des verflüssigten Gases aus der Auslauföffnung führen.The invention has for its object to enable a trouble-free shut-off and / or metering a low-boiling, liquefied gas in a simple manner. In this case, an interruption in the supply of the sealing gas should lead to an immediate exit of the liquefied gas from the outlet opening.

Diese Aufgabe wird bei einem gattungsgemässen Verfahren durch die kennzeichnenden Merkmale des Anspruchs 1 und bei einer gattungsgemässen Vorrichtung zur Durchführung des Verfahrens durch die kennzeichnenden Merkmale des Anspruchs 6 gelöst.This object is achieved in a generic method by the characterizing features of claim 1 and in a generic device for performing the method by the characterizing features of claim 6.

Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous developments of the invention are specified in the subclaims.

Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, dass ein störungfreies An- und Abstellen eines aus einer Auslauföffnung austretenden teifsiedenden, verflüssigten Gasstrahles in einfachster Art und Weise sichergestellt wird. Dabei kann vor der Befüllung des Systems mit der Flüssigkeit insbesondere die Auslauföffnung und die Kammer, ggf. aber auch das Gesamtsystem (Behälter, Leitung) mit trockenem Gas gespült werden.The advantages achieved by the invention are, in particular, that trouble-free starting and stopping of a partially boiling, liquefied gas jet emerging from an outlet opening is ensured in the simplest manner. Before the system is filled with the liquid, the outlet opening and the chamber in particular, but possibly also the entire system (container, line) can be flushed with dry gas.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown in the drawing and will be described in more detail below.

Es zeigen:

  • Fig. 1 einen Längsschnitt durch eine Vorrichtung zur Ausführung des Verfahrens nach der Erfindung;
  • Fig. 2 zwei Ausbildungen der Absperrvorrichtung nach der Erfindung;
  • Fig. 3 zwei Ausbildungen der Absperrvorrichtung bei einem rohrförmigen Behälter.
Show it:
  • 1 shows a longitudinal section through an apparatus for performing the method according to the invention.
  • Figure 2 shows two designs of the shut-off device according to the invention.
  • Fig. 3 shows two designs of the shut-off device in a tubular container.

Die in Fig. 1 dargestellte Vorrichtung besteht aus einem Sintermetallkörper 1, der sich am Ende der Leitung 2 befindet, die der Zufuhr des verflüssigten Gases dient. Der Sintermetallkörper 1 ist in einem Behälter 3 angeordnet, welcher in einer Behälterwand 14, eine mit Abstand 21 innerhalb des Behälters 3 angeordnete Auslauföffnung 4 für verflüssigtes Gas und in seinem oberen Teil mehrere Abzugsöffnungen 5 für verdampftes Gas enthält.The device shown in Fig. 1 consists of a sintered metal body 1, which is located at the end of the line 2, which serves to supply the liquefied gas. The sintered metal body 1 is arranged in a container 3 which, in a container wall 14, contains an outlet opening 4 for liquefied gas arranged at a distance 21 within the container 3 and in its upper part a plurality of discharge openings 5 for evaporated gas.

Die Auslauföffnung 4 ist in einem vorzugsweise zylindrischen Körper 22 angeordnet, der an seinem Umfang 23 ein Gewinde 24 aufweist. Mit dem Aussengewinde 24 ist der Körper 22 in einem, mit einem Innengewinde 25 versehenen Rohrstutzen 26 eingeschraubt, desssen in den Behälter 3 hineinragende Länge 27 grösser ist, als die Breite 28 des Körpers 22.The outlet opening 4 is arranged in a preferably cylindrical body 22 which has a thread 24 on its circumference 23. With the external thread 24, the body 22 is screwed into a pipe socket 26 provided with an internal thread 25, the length 27 of which protrudes into the container 3 is greater than the width 28 of the body 22.

Der Rohrstutzen 26 ist mit der der Auslaufseite 29 der Auslauföffnung 4 zugewandten Stirnseite 30 in einer seinem Aussendurchmesser 31 entsprechenden Öffnung der Behälterwand 14 angeordnet und mit der Behälterwand 14 verschweisst.The pipe socket 26 is arranged with the end face 30 facing the outlet side 29 of the outlet opening 4 in an opening of the container wall 14 corresponding to its outer diameter 31 and welded to the container wall 14.

Vor der Einlaufseite 32 der Auslauföffnung 4 ist ein topfförmiger, poröser Sintermetallkörper 13 auf einer mit dem Rhrstutzen 26 fest verbundenen Scheibe 33 eingebaut, der mit der den Boden bildenden Scheibe 33 eine von dem Behälter 3 abgetrennte Kammer 15 bildet. An die Kammer 15 ist eine Leitung 16 angeschlossen, welche mittels eines Magnetventils 17 gesperrt wird. Der Behälter 3 ist seinerseits von einem mit einer Isolierung versehenen zweiten Behälter 6 umgeben. Zwischen den Behältern 3 und 6 wird ein Zwischenraum 8 gebildet. Der Behälter 6 und die Isolierung 7 besitzen eine Gasaustrittsöffnung 9, die unterhalb der Auslassöffnung 4 für verflüssigtes Gas im Behälter 3 angeordnet ist.In front of the inlet side 32 of the outlet opening 4, a cup-shaped, porous sintered metal body 13 is installed on a disk 33 which is fixedly connected to the stub connector 26 and which forms a chamber 15 separated from the container 3 with the disk 33 forming the bottom. A line 16 is connected to the chamber 15 and is blocked by means of a solenoid valve 17. The container 3 is in turn surrounded by a second container 6 provided with insulation. Between Intermediate space 8 is formed between containers 3 and 6. The container 6 and the insulation 7 have a gas outlet opening 9 which is arranged below the outlet opening 4 for liquefied gas in the container 3.

Die Wirkungsweise der Vorrichtung nach der Erfindung ist folgende: Das unter Druck stehende und mit Gas vermischte verflüssigte Gas, z.B. Sticksoff, gelangt durch die Leitung 2 in den Sintermetallkörper 1, dessen Querschnitt grösser als der der Zuleitung ist. Der Sintermetallkörper 1 ist für gasförmiges und verflüssigtes Gas durchlässig. Der entspannte, nun unter atmosphärischem Druck stehende und bei -196° Celsius siedende flüssige Stickstoff 10 sammelt sich am Boden des Behälters 3. Der ebenfalls -196° Celsius kalte gasförmige Stickstoff tritt durch die Abzugsöffnungen 5 in den Zwischenraum 8 zwischen den Behältern 3 und 6 ein. Die Gasströmung ist durch Pfeile 11 bezeichnet. Das kalte Gas strömt nun langsam zu der grossen Gausaustrittsöffnung 9 und kühlt dabei die gesamte Vorrichtung so tief ab, dass dem in dem Behälter 3 befindlichen flüssigen Stickstoff möglichst wenig Wärme von aussen zugeführt wird. Wegen der geringen Geschwindigkeit des gasförmigen Stickstoffs 11 wird der durch die Auslauföffnung 4 austretende Strahl flüssigen Stickstoffs durch die Gasströmung nicht gestört. Da die Auslauföffnung 4 aus einem auswechselbaren Körper 22 besteht, kann die Stärke des austretenden Flüssigkeitsstrahls je nach Bedarf pro Zeiteinheit verändert werden. Ausser vom Querschnitt der Auslauföffnung 4 wird die kontinuierlich austretende Menge an flülligem Stickstoff pro Zeiteinheit noch durch die Höhe des Flüssigkeitsspiegels des flüssigen Stickstoffs 10 bestimmt. Der Flüssigkeitsspiegel wird deshalb mittels einer in ihrer Höhe verstellbaren Messsonde 12 konstant gehalten, die je nach Bedarf ein in der Leitung 2 angeordnetes, nicht näher dargestelltes Magnetventil öffnet oder schliesst. Der durch die Auslauföffnung 4 kontinuierlich austretende dosierte Flüssigkeitsstrahl wird durch die kontinuierliche Zufuhr eines Verschlussgases in die Kammer 15 sicher gesperrt. Dabei wird durch die Anordnung des die Auslauföffnung 4 beinhaltenden Körpers 22 mit Abstand 21 innerhalb des Behälters 3, die Auslauföffnung 4 über die gesamte Breite 28 mit flüssigem Stickstoff 10 umspült, so dass eine Kühlung der Auslauföffnung 4 während der gesamten Zeitdauer der Sperrung des Flüssigkeitsstrahles stattfindet. Zusätzlich wird durch das Aufsteigen des durch den flüssigen Stickstoff 10 perlenden Verschlussgases in den Zwischenraum 8 auch während der Sperrung des Flüssigkeitsstrahles eine Kühlung der Vorrichtung erzielt. Hierbei wird mit einem Absperrdruck von insbesondere 0,1 bis 0,4 bar über dem Druck des flüssigen Stickstoffes bei geringstem Gasverbrauch ein ausreichender Verschlussdruck erreicht, der die Kammmer 15 von der Flüssigkeit befreit und die Auslauföffnung 4 trocken hält, ohne dass es zu einer Vermischung des trockenen Verschlussgases mit der Flüssigkeit kommt. Dabei wird der geringe Absperrdruck durch die Anordnung des Sintermetallkörpers 13 vor der Auslauföffnung 4 erreicht, wobei einerseits der hydrostatische Druck des flüssigen Sticksoffes 10 auf die Kammer 15 verringert wird und andererseits zusätzliche Fremdpartikel, wie beispielsweise Metallspäne, von der Auslauföffnung 4 ferngehalten werden. Das, in die Kammer 15 mit einem vorzugsweise kleinen Kammervolumen von ca. 10 cm3 mit diesem Drick geförderte Verschlussgas entweicht einerseits durch die bei diesem Kammervolumen einen Durchmesser von ca. 2 mm aufweisende Auslauföffnung 4 und andererseits durch die unregelmässig geformten Öffnungen 34 des Sintermetallkörpers 13. Bei einer Unterbrechung der Gaszufuhr über das in der Leitung 16 angeordnete Magnetventil 17 tritt sofort wieder flüssiger Stickstoff an der Auslauföffnung 4 aus, ohne dass eine messbare Zeitdifferenz zwischen der Unterbrechung der Gaszufuhr und dem Austritt des Flüssigkeitsstrahles feststellbar ist. Selbstverständlich sind auch andere kältebeständige Filter, wie beispielsweise Siebe, verwendbar. Dabei müssen die Gesamtöffnungen 34 des Sintermetallkörpers 13 frösser sein, als die Auslauföffnung 4, um Verzögerungen im Flüssigkeitsdurchsatz durch die Auslauföffnungen 4 zu vermeiden.The operation of the device according to the invention is as follows: The pressurized and mixed with gas liquefied gas, for example nitrogen, passes through line 2 into sintered metal body 1, the cross section of which is larger than that of the feed line. The sintered metal body 1 is permeable to gaseous and liquefied gas. The relaxed, now at atmospheric pressure and boiling at -196 ° Celsius liquid nitrogen 10 collects at the bottom of the container 3. The likewise -196 ° Celsius cold gaseous nitrogen passes through the discharge openings 5 into the space 8 between the containers 3 and 6 a. The gas flow is indicated by arrows 11. The cold gas now flows slowly to the large outlet opening 9 and cools the entire device so deeply that as little heat as possible is supplied from the outside to the liquid nitrogen in the container 3. Because of the low speed of the gaseous nitrogen 11, the jet of liquid nitrogen emerging through the outlet opening 4 is not disturbed by the gas flow. Since the outlet opening 4 consists of an exchangeable body 22, the strength of the emerging liquid jet can be changed as needed per unit of time. In addition to the cross section of the outlet opening 4, the continuously exiting quantity of volatile nitrogen per unit of time is also determined by the level of the liquid nitrogen 10. The liquid level is therefore kept constant by means of a height-adjustable measuring probe 12, which opens or closes a solenoid valve, which is arranged in line 2 and is not shown, as required. The metered liquid jet continuously emerging through the outlet opening 4 is reliably blocked by the continuous supply of a sealing gas into the chamber 15. Due to the arrangement of the body 22 containing the outlet opening 4 at a distance 21 within the container 3, the outlet opening 4 is flushed with liquid nitrogen 10 over the entire width 28, so that the outlet opening 4 is cooled during the entire period of the blocking of the liquid jet . In addition, cooling of the device is achieved by the rising of the sealing gas bubbling through the liquid nitrogen 10 into the intermediate space 8 even during the blocking of the liquid jet. With a shut-off pressure of in particular 0.1 to 0.4 bar above the pressure of the liquid nitrogen with the lowest gas consumption, a sufficient sealing pressure is achieved which frees the chamber 15 from the liquid and keeps the outlet opening 4 dry without mixing of the dry sealing gas comes with the liquid. The low shut-off pressure is achieved by the arrangement of the sintered metal body 13 in front of the outlet opening 4, whereby on the one hand the hydrostatic pressure of the liquid nitrogen 10 on the chamber 15 is reduced and on the other hand additional foreign particles, such as metal chips, are kept away from the outlet opening 4. The sealing gas, which is conveyed into the chamber 15 with a preferably small chamber volume of approximately 10 cm 3 with this pressure, escapes on the one hand through the outlet opening 4 with a diameter of approximately 2 mm in this chamber volume and on the other hand through the irregularly shaped openings 34 of the sintered metal body 13 If the gas supply is interrupted via the solenoid valve 17 arranged in the line 16, liquid nitrogen immediately emerges again at the outlet opening 4 without a measurable time difference between the interruption of the gas supply and the exit of the liquid jet being ascertainable. Of course, other cold-resistant filters, such as sieves, can also be used. The total openings 34 of the sintered metal body 13 must be larger than the outlet opening 4 in order to avoid delays in the liquid throughput through the outlet openings 4.

Als besonders vorteilhaft hat sich die Verwendung der eigenen tiefkalten siedenden Gase der Dosiervorrichtung als Verschluss- bzw. Trocknungsgase erwiesen. Selbstverständlich ist es auch möglich, andere trockene Verschlussgase, deren Siedetemperatur unter der der flüssigen Gase liegt, wie z. B. Heliumgas für N2-flüssig bzw. N2-Gas für Argon flüssig, zu verwenden.The use of the cryogenic boiling gases of the metering device as sealing or drying gases has proven to be particularly advantageous. Of course, it is also possible to use other dry sealing gases whose boiling temperature is below that of the liquid gases, such as, for. B. helium gas for N 2- liquid or N 2 gas for argon liquid to use.

Fig. 2 zeigt eine weitere Ausbildung der Absperrvorrichtung nach der Erfindung, wobei in Fig. 2a eine vertikale Anordnung der Kammer 15 und in Fig. 2b eine horizontale Anordnung der Kammer 15 schematisch dargestellt ist. Die Kammer 15 wird hierbei von einem vor der Behälterwand 14 ausgebildeten Vorraum 18 des Behälters 3 gebildet, dessen Durchlassöffnung 20 für den flüssigen Stickstoff mit einem plattenförmigen Sintermetalkörper 13 verschlossen wird. In dem Vorraum 18 ist die durch das Verfahren nach der Erfindung besonders einfach und billig herstellbare Auslauföffnung 4 angeordnet. In die Kammer 15 mündet die Leitung 16 zur Zufuhr des Verschlussgases, welche in horizontaler oder vertikaler Lage (strichlinierte Darstellung) an die Kammer 15 angeschlossen werden kann.FIG. 2 shows a further embodiment of the shut-off device according to the invention, a vertical arrangement of the chamber 15 being shown in FIG. 2a and a horizontal arrangement of the chamber 15 being schematically shown in FIG. 2b. The chamber 15 is in this case formed by an antechamber 18 of the container 3 which is formed in front of the container wall 14 and whose passage opening 20 for the liquid nitrogen is closed with a plate-shaped sintered metal body 13. The outlet opening 4, which is particularly simple and inexpensive to produce by the method according to the invention, is arranged in the antechamber 18. The line 16 opens into the chamber 15 for supplying the sealing gas, which can be connected to the chamber 15 in a horizontal or vertical position (dashed line).

In Fig. 3a ist ein in horizontaler Lage angeordneter rohrförmiger Behälter 3 schematisch dargestellt, in desssen stirnseitiger Behälterwand 14 die Auslauföffnung 4 angeordnet ist. Die Kammer 15 des rohrförmigen Behälters 3 wird durch den Einbau eines plattenförmigen Sintermetallkörpers 13 vor der Auslauföffnung 4 erzeugt. An die Kammer 15 ist die Leitung 16 zur Zufuhr des Verschlussgases angeschlossen.FIG. 3a schematically shows a tubular container 3 arranged in a horizontal position, in whose end-side container wall 14 the outlet opening 4 is arranged. The chamber 15 of the tubular container 3 is created by installing a plate-shaped sintered metal body 13 in front of the outlet opening 4. The line 16 for supplying the sealing gas is connected to the chamber 15.

Ist der rohrförmige Behälter 3 zur Auslauföffnung 4 unter einem horizontal ansteigenden Winkel 19 von vorzugsweise grösser 15 Grad angeordnet, oder weist der nicht näher dargestellte Behälter 3 eine auf den Kopf gestellte, L-förmige Aussenkontur auf, in deren oberem abgewinkelten Teil die Auslauföffnung 4 angeordnet ist, arbeitet die Absperrvorrichtung ohne einen Sintermetallkörper 13. Die Kammer 15 wird hierbei durch die innerhalb des rohrförmigen Behälters 3 erhaltene Gasblase gebildet.Is the tubular container 3 to the outlet opening 4 arranged at a horizontally increasing angle 19 of preferably greater than 15 degrees, or does the one not shown Container 3 has an upside-down, L-shaped outer contour, in the upper angled part of which the outlet opening 4 is arranged, the shut-off device works without a sintered metal body 13. The chamber 15 is hereby formed by the gas bubble obtained within the tubular container 3.

Claims (9)

1. Process for the shutting-off and/or metering of a liquid, which can flow from an outlet opening (4) of a tank (3), a gas bubble being built up under increased pressure ahead of the outlet opening (4) for the shutting-off of the outflowing liquid and the increased pressure of the gas bubble being equivalent at least to the overall pressure of the liquid prevailing in the vicinity of the outlet opening (4), characterized in that the tank (3) is insulated against low temperatures and is filled with a low-boiling, liquefied gas and in that, within the tank (3), a porous body (13) is arranged ahead of the outlet opening (4) and the gas bubble is built up between the porous body (13) and the outlet opening (4) and is maintained by continuous supply of a closure gas.
2. Process according to Claim 1, characterized in that the gas bubble is maintained with a shut-off pressure of 0.1 to 5 bar above the pressure of the liquefied gas.
3. Process according to Claim 1 or 2, characterized in that the gas bubble is maintained with a shut-off pressure of 0.1 to 0.4 bar above the pressure of the liquefied gas.
4. Process according to one of Claims 1 to 3, characterized in that the tank (3) is arranged at a horizontally rising angle (19) with respect to the outlet opening (4).
5. Process according to one of Claims 1 to 4, characterized in that the tank (3) is arranged at a horizontally rising angle of more than 15 degrees with respect to the outlet opening (4).
6. Apparatus for implementation of the process according to Claim 1, with a tank which contains an outlet opening (4) for a liquid and a shut-off device assigned to the latter, the shut-off device being formed by a separate chamber (15), which has an inflow for the liquid and which is connected to a line for the supply of a closure gas, characterized in that the tank is insulated against low temperatures and is filled with a low-boiling gas and the inflow (20) of the chamber (15) is designed as a porous body (13).
7. Apparatus according to Claim 6, characterized in that the chamber (15) and the body (22) containing the outlet opening (4) are arranged with a spacing (21) within the tank (3) and are surrounded by the liquefied gas.
8. Apparatus according to Claim 6 or 7, characterized in that the total openings (34) of the porous body (13) are greater than the outlet opening (4).
9. Apparatus according to one of Claims 6 to 8, characterized in that the porous body (13) is a potshaped sintered body.
EP19840116275 1984-01-24 1984-12-24 Process and device for measuring small quantities of a low-boiling liquefied gas Expired EP0149843B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84116275T ATE39561T1 (en) 1984-01-24 1984-12-24 METHOD AND DEVICE FOR DOSING SMALL QUANTITIES OF A LOW-BOILING, LIQUEFIED GAS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3402292 1984-01-24
DE3402292A DE3402292C2 (en) 1984-01-24 1984-01-24 Method and device for dosing small amounts of a low-boiling, liquefied gas

Publications (3)

Publication Number Publication Date
EP0149843A2 EP0149843A2 (en) 1985-07-31
EP0149843A3 EP0149843A3 (en) 1986-05-14
EP0149843B1 true EP0149843B1 (en) 1988-12-28

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ID=6225735

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EP19840116275 Expired EP0149843B1 (en) 1984-01-24 1984-12-24 Process and device for measuring small quantities of a low-boiling liquefied gas

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US (1) US4586343A (en)
EP (1) EP0149843B1 (en)
JP (1) JPS60168996A (en)
AT (1) ATE39561T1 (en)
AU (1) AU571156B2 (en)
CA (1) CA1258837A (en)
DE (1) DE3402292C2 (en)
DK (1) DK160641C (en)
ES (2) ES8609658A1 (en)
FI (1) FI77926C (en)
NO (1) NO161343C (en)
NZ (1) NZ210879A (en)
ZA (1) ZA85531B (en)

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Publication number Priority date Publication date Assignee Title
DE3642199A1 (en) * 1986-12-10 1988-06-30 Linde Ag DEVICE FOR DOSING LOW-BOILED LIQUID GASES
US4956975A (en) * 1989-08-17 1990-09-18 Gustafson Keith W Shutoff valve for cryogenic liquid storage tank
US5271232A (en) * 1990-07-20 1993-12-21 Toshiba Ceramics Co., Ltd. Filtration apparatus
FR2688469A1 (en) * 1992-03-16 1993-09-17 Air Liquide Device for sequenced injection of a metered amount of cryogenic liquid
US5272881A (en) * 1992-08-27 1993-12-28 The Boc Group, Inc. Liquid cryogen dispensing apparatus and method
GB9309637D0 (en) * 1993-05-11 1993-06-23 Boc Group Plc Cryogenic liquid dispensers
US5385025A (en) * 1994-03-04 1995-01-31 Mg Industries Apparatus and method for dispensing droplets of a cryogenic liquid
US5495717A (en) * 1994-05-04 1996-03-05 Messer Griesheim Gmbh Insulated container for storing liquid helium
GB9419055D0 (en) * 1994-09-21 1994-11-09 Boc Group Plc Liquid dispenser flow calming
DE102005044534B3 (en) 2005-09-17 2007-06-06 Astrium Gmbh Fuel tank for cryogenic liquids

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Also Published As

Publication number Publication date
EP0149843A2 (en) 1985-07-31
DE3402292A1 (en) 1985-08-01
NO161343B (en) 1989-04-24
JPS60168996A (en) 1985-09-02
NO845221L (en) 1985-07-25
AU571156B2 (en) 1988-03-31
AU3802685A (en) 1985-08-01
FI77926B (en) 1989-01-31
ES8609658A1 (en) 1986-09-01
EP0149843A3 (en) 1986-05-14
FI850269A0 (en) 1985-01-21
CA1258837A (en) 1989-08-29
DK160641C (en) 1991-09-02
ES554852A0 (en) 1988-02-16
DE3402292C2 (en) 1986-01-23
US4586343A (en) 1986-05-06
ATE39561T1 (en) 1989-01-15
JPH0559319B2 (en) 1993-08-30
NO161343C (en) 1989-08-02
NZ210879A (en) 1986-09-10
ES539609A0 (en) 1986-09-01
ZA85531B (en) 1985-08-28
FI850269L (en) 1985-07-25
DK160641B (en) 1991-04-02
FI77926C (en) 1989-05-10
DK29585D0 (en) 1985-01-23
DK29585A (en) 1985-07-25
ES8801556A1 (en) 1988-02-16

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